.page-faq {
  --faq-line: 1px solid var(--grid);
  --faq-gap: clamp(1rem, 3.5vw, 2rem);
  display: block;
  padding-bottom: clamp(2.5rem, 7vw, 5rem);
}

.page-faq a:focus-visible,
.page-faq button:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumb {
  padding-block: 1.1rem .4rem;
}

.page-faq .crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .05em;
  color: var(--mist);
}

.page-faq .crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-faq .crumb a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-faq .crumb__sep {
  color: var(--grid);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: var(--faq-gap);
  padding-block: 1.2rem clamp(2rem, 5vw, 3.2rem);
  align-items: end;
}

.page-faq .faq-hero__head {
  max-width: 44rem;
}

.page-faq .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero h1 {
  margin: .7rem 0 1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 8vw, 3.5rem);
  line-height: 1.04;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 38rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.6rem;
}

.page-faq .faq-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 2px solid var(--grid);
  background: var(--stand);
  box-shadow: var(--shadow-hard);
  aspect-ratio: 4 / 3;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-faq .media-frame__tag {
  position: absolute;
  inset: auto 0 0 0;
  margin: 0;
  padding: 1.4rem .9rem .75rem;
  background: linear-gradient(to top, rgba(5, 15, 13, .94), rgba(5, 15, 13, 0));
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .03em;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 章节头 ---------- */
.page-faq .section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .4rem .9rem;
  padding-bottom: .9rem;
  border-bottom: 2px solid var(--grid);
}

.page-faq .section-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 4.5vw, 2rem);
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-faq .section-head__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--cyan);
}

/* ---------- 高频三条 ---------- */
.page-faq .faq-desk {
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2rem, 5vw, 3rem);
}

.page-faq .faq-desk__grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.4rem;
}

.page-faq .faq-card {
  position: relative;
  padding: 1.3rem 1.2rem 1.45rem;
  background: var(--stand);
  border: 2px solid var(--grid);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--cyan);
}

.page-faq .faq-card--lamp::before {
  background: var(--lamp);
}

.page-faq .faq-card--hot::before {
  background: var(--ref);
}

.page-faq .faq-card__num {
  margin: 0 0 .5rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.4rem, 11vw, 3.6rem);
  line-height: .82;
  letter-spacing: -.05em;
  color: var(--cyan);
}

.page-faq .faq-card--lamp .faq-card__num {
  color: var(--lamp);
}

.page-faq .faq-card--hot .faq-card__num {
  color: var(--ref);
}

.page-faq .faq-card__q {
  margin: 0 0 .55rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.14rem;
  line-height: 1.35;
  color: var(--paper);
}

.page-faq .faq-card__a {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-card__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 242, 196, .45);
}

.page-faq .faq-card__a a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 问答主体 ---------- */
.page-faq .faq-board {
  padding-block: clamp(1.5rem, 4vw, 2.5rem) 0;
}

.page-faq .faq-board__layout {
  display: grid;
  gap: 1.4rem;
  margin-top: 1.4rem;
}

.page-faq .faq-board__main {
  min-width: 0;
}

/* 分类轨 */
.page-faq .faq-rail {
  min-width: 0;
}

.page-faq .faq-rail__label {
  margin: 0 0 .55rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-rail__list {
  display: flex;
  gap: .5rem;
  margin: 0;
  padding: 0 0 .2rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-rail__list li {
  flex: 0 0 auto;
}

.page-faq .faq-rail__list a {
  display: flex;
  align-items: center;
  gap: .45rem;
  padding: .55rem .8rem;
  border: 1px solid var(--grid);
  background: var(--stand);
  color: var(--mist);
  font-size: .86rem;
  line-height: 1.3;
  white-space: nowrap;
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}

.page-faq .faq-rail__list a:hover {
  color: var(--paper);
  border-color: var(--cyan);
}

.page-faq .faq-rail__list a[aria-current] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .74rem;
  letter-spacing: .04em;
  opacity: .85;
}

/* 分组 */
.page-faq .faq-group {
  margin-bottom: clamp(1.8rem, 5vw, 2.8rem);
  scroll-margin-top: calc(var(--bar-h) + 1.5rem);
}

.page-faq .faq-group:last-child {
  margin-bottom: 0;
}

.page-faq .faq-group__title {
  display: flex;
  align-items: center;
  gap: .7rem;
  margin: 0 0 .9rem;
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--grid);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.15rem, 4vw, 1.45rem);
  line-height: 1.2;
  color: var(--paper);
}

.page-faq .faq-group__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.9rem;
  height: 1.9rem;
  flex: 0 0 auto;
  background: var(--grid);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: .85rem;
  font-weight: 700;
}

.page-faq .faq-group__figure {
  position: relative;
  margin: 0 0 1rem;
  overflow: hidden;
  border: 2px solid var(--grid);
  background: var(--stand);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, .4);
}

.page-faq .faq-group__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* 展开组 */
.page-faq .expand {
  display: block;
}

.page-faq .expand__item {
  margin-bottom: .6rem;
  border: 1px solid var(--grid);
  background: var(--stand);
  transition: border-color .18s var(--ease), background .18s var(--ease);
}

.page-faq .expand__item:hover {
  border-color: rgba(56, 242, 196, .5);
}

.page-faq .expand__item:last-child {
  margin-bottom: 0;
}

.page-faq .expand__h {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-faq .expand__trigger {
  display: flex;
  align-items: flex-start;
  gap: .7rem;
  width: 100%;
  padding: .95rem .9rem;
  border: 0;
  background: transparent;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: .95rem;
  font-weight: 500;
  line-height: 1.6;
  text-align: left;
  cursor: pointer;
}

.page-faq .expand__index {
  flex: 0 0 auto;
  padding-top: .08rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--cyan);
}

.page-faq .expand__label {
  min-width: 0;
}

.page-faq .expand__sign {
  position: relative;
  flex: 0 0 auto;
  margin-left: auto;
  width: 1rem;
  height: 1rem;
  margin-top: .32rem;
}

.page-faq .expand__sign::before,
.page-faq .expand__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}

.page-faq .expand__sign::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  transform: translateY(-50%);
}

.page-faq .expand__sign::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
}

.page-faq .expand__trigger[aria-expanded="true"] .expand__sign::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

.page-faq .expand__trigger[aria-expanded="true"] {
  color: var(--cyan);
}

.page-faq .expand__panel {
  border-top: 1px solid var(--grid);
}

.page-faq .expand__panel[hidden] {
  display: none;
}

.page-faq .expand__body {
  padding: .9rem .95rem 1.15rem;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .expand__body p {
  margin: 0 0 .75rem;
}

.page-faq .expand__body p:last-child {
  margin-bottom: 0;
}

.page-faq .expand__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 242, 196, .45);
}

.page-faq .expand__body a:hover {
  border-bottom-color: var(--cyan);
}

/* 步骤列表 */
.page-faq .faq-steps {
  counter-reset: faqstep;
  display: grid;
  gap: .5rem;
  margin: .2rem 0 .8rem;
  padding: 0;
  list-style: none;
}

.page-faq .faq-steps li {
  counter-increment: faqstep;
  display: flex;
  gap: .6rem;
  align-items: flex-start;
}

.page-faq .faq-steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 700;
  color: var(--cyan);
  padding-top: .15rem;
}

.page-faq .faq-steps--hot li::before {
  color: var(--ref);
}

/* ---------- 求助出口 ---------- */
.page-faq .faq-help {
  margin-top: clamp(2rem, 6vw, 3.5rem);
  background: var(--wine);
  border-block: 2px solid var(--ref);
}

.page-faq .faq-help__inner {
  padding-block: clamp(2rem, 6vw, 3.2rem);
}

.page-faq .faq-help__index {
  margin: 0 0 .7rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ref);
}

.page-faq .faq-help__title {
  margin: 0 0 .9rem;
  max-width: 32ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 5.5vw, 2.4rem);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-faq .faq-help__text {
  margin: 0;
  max-width: 44rem;
  font-size: .96rem;
  line-height: 1.85;
  color: rgba(243, 248, 240, .82);
}

.page-faq .faq-help__text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 242, 196, .5);
}

.page-faq .faq-help__text a:hover {
  border-bottom-color: var(--cyan);
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.5rem;
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-desk__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-hero__media {
    aspect-ratio: 16 / 9;
  }

  .page-faq .expand__body {
    padding-left: 3.1rem;
    padding-right: 1.6rem;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, .55fr);
    gap: clamp(1.5rem, 4vw, 3rem);
    padding-block: 1.8rem 3.5rem;
  }

  .page-faq .faq-hero__media {
    aspect-ratio: 3 / 4;
  }

  .page-faq .faq-board__layout {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(1.5rem, 4vw, 2.8rem);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--bar-h) + 1.2rem);
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    overflow-x: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__list li {
    flex: 0 0 auto;
  }

  .page-faq .faq-rail__list a {
    width: 100%;
    white-space: normal;
    padding: .6rem .75rem;
    border-left: 3px solid transparent;
  }

  .page-faq .faq-rail__list a[aria-current] {
    border-left-color: var(--ink);
  }

  .page-faq .expand__trigger {
    padding: 1.1rem 1.2rem;
    font-size: 1rem;
  }

  .page-faq .expand__body {
    padding: 1rem 1.5rem 1.3rem 3.6rem;
  }

  .page-faq .faq-group__figure {
    margin-bottom: 1.2rem;
  }

  .page-faq .faq-help__inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 1120px) {
  .page-faq .faq-desk__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-faq .faq-card {
    padding: 1.6rem 1.5rem 1.8rem;
  }

  .page-faq .faq-board__layout {
    grid-template-columns: 224px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}
<<<END>>>